Piston.



inn

Prs'roiv.

though its use is not limited to such type of mes.

eng I f The object of the invention being to so con- 'struct the head end of the pistonas to prevent excessive heating of this portion.

A further object of the invention is to provide a structure that will efliciently and thoroughlydirect the incoming charge of comfbustible Vapor to theupper end of the cylinder and intoproximity to the ignition devices that are located therein.

A further object of he invention is to form I the-head end of the piston so that the burned gases can readily escape from the cylinder through the outlet'ports.

Further objects of the invention will be Specification of Letters Patent. Application filed September 20,1907: Serial No. 393364.

fully described in the body of thespecification and particularly pointed out in the claims.

F igure .1 is a transverse sectional view on the line 1-1, Fig. 3, showing the arrangement bfthe channels for the incoming vaporous charge, with the inlet ports registering with said-channels.

Fig. 2 is a sectional plan view on the line 2.-2 of Fig. 3 showing the relative location of thechannels in the head-end of the iston and theoutlet passages in the cylinder or the burned gases in their escapefrom the interior of the cylinder. Fig. 3 is a vertical longitudinal sectional view on the hue 3-3 of Fig. 1, showing the inlet channels in the head 'endof the piston registering with the inlet ports in the cylinder.

Referring to the drawings in detaila designates the cylinder provided with inlet passages b and the annular exhaust passage 0. The inlet ports (Z and exhaust ports 6 being arranged in their proper relation to each other.

This invention relates primarily to improvements in the construction of the head end of the piston for use in two cycle engines.

It has been found from experience that the head end of the piston becomes excessively hotby reason of the burned gases passlng Patented Jan. mcee.

thereover after each eirplosion and inorder:

efficient cooling of this part of the piston canbe maintained.

Referring in detail to construction of piston, f designates radially arranged channels that are formed in the head end of the piston and through which. the incoming vaporous charge from the ports (1 passes. This charge when it reaches the center portion of the piston comes into contact with a cone or pyramid-shaped boss or projection g which directs the vaporous charge upward toward the center or top portion of the cylinder and into contact with, or in close proximity to the ignition device or plug which is secured to this part of the cylinder as shown at h. It will be observed that these channels are open at the top, or outer end as plainly indicated in Fig. 2, so that the incoming charge is practically confined in these channels, and that the outgoing or burned gases are deflected or come in contact with the ledge or shoulder shaped quadrants of the piston. The edge of the piston is chamfered as shown at which also aids in directing the burned gases through the ports 6. From this construction it will be seen that by reason of the small amount of metal employed in the head end of the piston there is very little danger of this part becoming over-heated, since the cool incoming vaporous charge in passing through the channels will serve to keep the parts i cool which had previously been heated by the 'esraping burned gases while at the same time the incoming charge .is practically confined in the channels and is directed upward or deflected by meansof the boss g towards the head endof the cylinder. v

It should be mentioned that the location of the boss or deflecting. element g is not necessarily located at the exact center of the piston head, but is approximately so located. Furthermore the sides of the channels and boss are not limited to a cast structure, but elements may be attached to the piston head in any suitable manner.

The exact shape, size; and number of parts in my construction may be changed in any suitable way without departing from the spirit and scope of my invention; and that equivalent structures is understood to be ineluded herein. a

What I claim, is:

. 1i A iston having a plurality-ofehannels f on the ead end thereof and extending'in-- Wards from the. periphery thereof, the channels heiniarranged to' register with the inlet ports at t e end of the piston stroke. j I

A piston having its head end providedwith channels one Slde thereof being-open; 1

ton the projection extending toward the head end of the cylinder, whereby the-incoming charge from inlet orts in the cylinder to the passageways \Vii he directed toward. the

head end. of the cylinder, as described.

Witnesses:

K. I. CLEMoNs, H. V\ BOWEN.

., HARRY Ansrrxirxox; 

